West Control Solutions MRC 7000 Recorder Manual - Manual (Page 35)

35
TABLE 4-1 CALIBRATION PROCEDURES
Calibration
Procedure
Description
CAL 1 Reinitialization of program and tuning values.
CAL 2 Main calibration necessary for all input types.
CAL 3 Cold Junction Compensation calibration used to correct for component
variation in the CJC circuit. Necessary for thermocouple inputs.
CAL 4 Cold Junction Utility, displays temperature the cold junction compensator
is sensing. No adjustment is made with this procedure.
CAL 5 RTD input calibration. Necessary to be performed on both terminal boards.
CAL 6 Cold Junction Compensation on/off. Used for validating thermocouple
inputs with a millivolt source. (Non temperature compensating)
CAL 7 Factory use only.
CAL 9 Pen position calibration used to calibrate pens to chart.
4.4.1 CAL 1 PARAMETER RE-INITIALIZATION
This routine is used to clear all information in the Program and Alarm Set modes. All parame-
ters will be reset to default values.
Before performing this procedure, make sure that the
Program and Alarm values are written down so that they can be re-entered after
Calibration 1 is completed. No test equipment required.
With CAL 1 displayed, while pressing the DOWN key, press the SCROLL key. The display
will momentarily blank while the initialization is in progress. Upon completion of the routine, a
Pen Home function is automatically performed; P dn is displayed during this period, with the
decimal point flashing to indicate this mode. Once the pen(s) reach Pen Home, CAL1 will be
displayed.
4.4.2 CAL 2 MAIN CALIBRATION
This routine determines and saves calibration values which correct for component variations
relating to the basic measuring function of the unit. A 50.00 mVDC
±
.01mVDC source is
required for testing. Make sure that the Processor board jumpers JU4 and JU5 are in the
non-volt positions. See Appendix A-1 (page 50) for proper positioning. After completing
CAL2, be sure to re-position these jumpers to the appropriate position for your input.
With CAL 2 displayed, press and hold the DOWN key, then press the SCROLL key. Release
the keys when the instrument displays hLd1. Short the input terminals or apply 0.00,
±
.01
mVDC to TB 4 terminals 1 and 2. Press the DOWN key and dELy will appear for 10 sec-
onds, then SCAn will appear for 10 seconds. A calibration reference number will then appear,
this should be 0
±
50. If this number falls outside these limits, press the SCROLL key and
CAL 2 will be displayed. Perform the calibration again. Repeat the calibration until the number
falls within the tolerance limits. If the number remains outside the limits, check the connec-
tions and try the calibration again. If the number does not approach the tolerance limits
contact the nearest representative or the factory for assistance. With an acceptable reference
number on the display, remove the short and connect a 50.00,
±
.01 mVDC source to the TB
4 terminals 1 and 2. Be sure to observe the proper polarity when connecting the source.
Terminal 1 is positive and terminal 2 is negative. Press the DOWN key, deLy will be dis-
played for 10 seconds and then SCAn for 10 seconds. When the calibration is complete CAL
2 will reappear.
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